A Survey of Current Rotorcraft Propulsion Health Monitoring Technologies

Abstract A brief review is presented on the state-of-the-art in rotorcraft engine health monitoring technologies including summaries on current practices in the area of sensors, data acquisition, monitoring and analysis. Also, presented are guidelines for verification and validation of Health Usage Monitoring System (HUMS) and specifically for maintenance credits to extend part life. Finally, a number of new efforts in HUMS are summarized as well as lessons learned and future challenges. In particular, gaps are identified to supporting maintenance credits to extend rotorcraft engine part life. A number of data sources were consulted and include results from a survey from the HUMS community, Society of Automotive Engineers (SAE) documents, American Helicopter Society (AHS) papers, as well as references from Defence Science & Technology Organization (DSTO), Civil Aviation Authority (CAA), and Federal Aviation Administration (FAA). Nomenclature AE Acoustic Emissions AI Artificial Intelligence AHS American Helicopter Society CAA Civil Aviation Authority CAP Civil Aviation Publication CBM Condition-Based Maintenance CI Condition Indicator DSTO Defence Science & Technology Organization FAA Federal Aviation Administration FADEC Full-Authority Digital Electronic Control HUMS Health Usage Monitoring System ICA Instructions for Continued Airworthiness IMDS Integrated Mechanical Diagnostic System IVHMS Integrated Vehicle Health Management System JTFA Joint Time Frequency Analysis LTFC Life-to-First-Crack LUI Life Usage Index MFOQA Military Flight Operations Quality Assurance nRTDA near Real-Time Damage Assessment NASA National Aeronautics and Space Administration NATO North Atlantic Treaty Organization OSST Operations Support & Sustainment Technologies Program (U.S. Army)

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